Absolute-age dating techniques can be used to determine the age of which of these? select all that apply.
a. earth
b. some rocks
c. some fossils
d. substances made entirely of pb-206
e. substances made entirely of ar-40

"Absolute-age dating techniques" can be used to determine the "age of Earth, rocks, fossils", "substances made entirely of Pb-206" and "substances made entirely of Ar-40".

Explanation:

Radiometric dating is one of the absolute-age dating techniques that is used to determine the age of different rocks, fossils, etc. These calculations are done based on the "decay of radioactive elements" such as uranium, potassium. This method is accurate to produce results approximately which shows that life existed on earth billion years ago. The radioactive elements gradually decay into other elements over a period of time such that the first element is the parent element and the element after the decay is the daughter element. The ratio of a parent-daughter element determines the age of the sample. If it is higher, the age is more and less of the ratio is less. if the ratio is infinity then the sample is of infinite age.